(19)
(11) EP 0 338 586 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.11.1990 Bulletin 1990/47

(43) Date of publication A2:
25.10.1989 Bulletin 1989/43

(21) Application number: 89107257.1

(22) Date of filing: 21.04.1989
(51) International Patent Classification (IPC)4: G02C 5/00
(84) Designated Contracting States:
DE GB IT

(30) Priority: 21.04.1988 JP 96737/88

(71) Applicants:
  • TOKIN CORPORATION
    Sendai-shi Miyagi-ken 982 (JP)
  • NAKANISHI OPTICAL CORPORATION
    Kita-ku Osaka (JP)

(72) Inventor:
  • Sato, Syoichi
    Sendai-shi Miyagi-ken (JP)

(74) Representative: Prüfer, Lutz H., Dipl.-Phys. 
Harthauser Strasse 25d
81545 München
81545 München (DE)


(56) References cited: : 
   
       


    (54) Eyeglass frame having Ti-Ni-V alloy element with improved wear comfortability


    (57) In an eyeglass frame comprising a pair of lens fixing rims, a bridge connecting the paired rims, and a pair of temples, the bridge and/or the temples are made of Ti-Ni-V alloy having a super elasticity of a generally rectangular stress-strain hysteresis loop over a relevant temperature range of 0-20°C so as to improve eyeglass wearing comfortability. The Ti-Ni-V alloy comprises Ni and Ti with an atomic ratio Ni/Ti of 1.02-1.06 and V 0.25-2.0 at.%, and is worked into a desired shape and thereafter is heat-treated at 425-525°C for 10-60 minutes.







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